• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Classical cationic polymerization of styrene in a spinning disc reactor using silica-supported BF3 catalyst
【24h】

Classical cationic polymerization of styrene in a spinning disc reactor using silica-supported BF3 catalyst

机译：使用二氧化硅负载的BF3催化剂在转盘反应器中苯乙烯的经典阳离子聚合

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The carbo-cationic polymerization of styrene has been studied in a Spinning Disc Reactor (SDR) and the results were compared to those observed in a conventional Stirred Tank Reactor (STR). Addition of styrene to a slurry of silica-supported boron trifluoride (BF3/SiO2) in 1,2-dichloroethane led to uncontrollable reactions in the STR at monomer concentrations > 25%w/w and initial temperatures of 20-25 degrees C. By comparison, monomer concentrations of 75%w/w were safely and controllably polymerized in the SDR at 40 degrees C to yield polymers with molecular weights comparable to those reported in the literature for polymer prepared at -60 degrees C. Exceptional heat transfer rates achieved in the SDR are sufficient to deal with the heat evolved when styrene is polymerized at concentrations as high as 75%w/w, the reaction proceeding under essentially isothermal conditions. In the present study, the effects of monomer/solvent feed rates, monomer concentrations, disc size, and disc speed on monomer conversions, polymer molecular weights, and polydispersities achieved in the SDR are investigated. Speculative explanations of the observed results are presented in terms of enhanced mixing effects on the polymerization mechanisms in the SDR. (c) 2006 Wiley Periodicals, Inc.
机译：在旋转盘式反应器（SDR）中研究了苯乙烯的碳阳离子聚合，并将结果与​​常规搅拌釜反应器（STR）中观察到的结果进行了比较。将苯乙烯添加到二氧化硅负载的三氟化硼（BF3 / SiO2）在1,2-二氯乙烷中的浆液中会导致STR中单体浓度> 25％w / w且初始温度为20-25℃时反应失控。相比之下，SDR在40摄氏度下安全可控地聚合了75％w / w的单体浓度，得到的聚合物的分子量可与文献中报道的在-60摄氏度下制备的聚合物相媲美。当苯乙烯以高达75％w / w的浓度聚合时，SDR足以应对放出的热量，反应在基本上等温的条件下进行。在本研究中，研究了在SDR中单体/溶剂进料速率，单体浓度，圆盘​​尺寸和圆盘速度对单体转化率，聚合物分子量和多分散性的影响。根据对SDR中聚合机理的增强混合效果，对观察到的结果进行了推测性解释。 （c）2006年Wiley Periodicals，Inc.

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号